I have one of those Game Gears somewhere
. It was really cool when I got it (like 10 years ago, man so much time!) but I had to use the batery pack (external rechargable batery), because with standard bateries you couldn't play for too long (I think it needed 6 not 4). Games were very nice and the screen was awesome (still better than curreng GBA screens, not as much resolution, but with backlight.) I even had the TV tunner.